I am asking for help from FAB Marketplace sellers.

Hello everyone,
I am a senior 3D character artist with over 10 years of experience.
I have been working as a freelancer on Upwork for the past few years.
I am currently planning to create and sell my artwork on FAB Marketplace.
However, I have many questions.
I am not yet sure which characters I should sell to ensure there is demand for my work.
I would like to hear the advice of experienced sellers on FAB Marketplace.
I am currently conceptualizing my artwork, so please review this.